Type-I superconductor

The interior of a bulk superconductor cannot be penetrated by a weak magnetic field, a phenomenon known as the Meissner effect.

In type-I superconductors, superconductivity is abruptly destroyed via a first order phase transition when the strength of the applied field rises above a critical value Hc.

[1] and BeAu [2] The covalent superconductor SiC:B, silicon carbide heavily doped with boron, is also type-I.

This state, first described by Lev Landau, is a phase separation into macroscopic non-superconducting and superconducting domains forming a Husimi Q representation.

The ratio of the London penetration depth λ to the superconducting coherence length ξ determines whether a superconductor is type-I or type-II.

Phase diagram ( B , T ) of a type I superconductor : if B < B c , the medium is superconducting. T c is the critical temperature of a superconductor when there is no magnetic field.